Faulty Kenwood R 1000 - UK Vintage Radio Repair and Restoration Discussion Forum

AmateurZS2RD · 2nd Apr 2021, 7:42 am

I have recently been given a Kenwood R1000 and it has a most peculiar fault.

On connecting the power lead the receiver's display shows a figure 5 and after a few seconds, the 5 becomes a 0.

Switching the set on and pressing any of the buttons or controls does nothing. The receiver does not work and the display remains on zero.

Should I suspect the MSM5524 has gone faulty.

Does the MSM5524 control the operation of the receiver?

If it is the IC, does anyone know where I can source one?

Thanks Roger ZS2RD

(Ex G4TTE, ZS5ZD, ZS5L, ZS1J)

Kentode · 2nd Apr 2021, 8:08 am

One in stock at Jotrin, just Google it.

Hope this helps and welcome to the forum.

HECTOR63 · 2nd Apr 2021, 8:34 am

Yes I have one aswell which has been well messed about with! Been looking for replacement aswell, but there was a work round on a previous thread that I posted with regards to a You tube video on the subject but its not clear still as yet as to why so many parts were removed just to replace the display etc, but it appears to have been successful apparently! Meanwhile sorting out a number of issue with one I have, great shame brilliant radios but this has been hacked something rotten!!

HECTOR63 · 2nd Apr 2021, 8:36 am

https://www.vintage-radio.net/forum/...d.php?t=178068

This is the link that may help.

AmateurZS2RD · 2nd Apr 2021, 8:51 am

Is the IC purely for the display or is it part of the receivers circuitry as the receiver is totally dead as the on off switch does nothing to either rthe display or the dead receiver?

When the radio is switched on, the lights on the meter and the kHz tuning display illuminate.

I have also checked all voltages out of the PSU board on connector 12 and all voltages are present and correct.

This unit really has me puzzled as there are very few test points that I can see.

I do have the service manual for the unit.

Station X · 2nd Apr 2021, 9:45 am

These receiver's will work even if the MSM5524 has been removed. Time to get the signal generator out.

Here's how I replaced the chip in mine:-

https://www.vintage-radio.net/forum/...ead.php?t=9585

HECTOR63 · 2nd Apr 2021, 11:23 am

Tried the Jotrin and part N/A same as Mark5 link aswell so still waiting on display model to apply as per previous advices on this with you tube video

Top Cap · 3rd Apr 2021, 11:38 pm

There was an article in the Radio & Electronics World where they compared the FRG7700 with the Trio R1000. They covered parts of the circuitry that may be useful, I found them on the American WorldRadioHistory site.
https://worldradiohistory.com/UK/Rad...EW-1981-12.pdf
Pages 48 to 53.

For info on the Phase Locked Loops and frequency display see:-
https://worldradiohistory.com/UK/Rad...EW-1982-01.pdf
Pages 76 to 81.

Final Part https://worldradiohistory.com/UK/Rad...EW-1982-02.pdf
Pages 28 to 31

HECTOR63 · 5th Apr 2021, 10:43 am

Quote:

Originally Posted by Top Cap

There was an article in the Radio & Electronics World where they compared the FRG7700 with the Trio R1000. They covered parts of the circuitry that may be useful, I found them on the American WorldRadioHistory site.
https://worldradiohistory.com/UK/Rad...EW-1981-12.pdf
Pages 48 to 53.

For info on the Phase Locked Loops and frequency display see:-
https://worldradiohistory.com/UK/Rad...EW-1982-01.pdf
Pages 76 to 81.

Final Part https://worldradiohistory.com/UK/Rad...EW-1982-02.pdf
Pages 28 to 31

Superb information on these receivers and have followed up with downloads and prints as I have an FRG7700 and R-1000 both with display issues and some very helpful refreshes on PLL operations and synthesis as an aside too.

2nd Apr 2021, 7:42 am	#1
AmateurZS2RD Diode Join Date: Apr 2021 Location: Plettenberg Bay, Western Cape Province, South Africa. Posts: 8	Faulty Kenwood R 1000 I have recently been given a Kenwood R1000 and it has a most peculiar fault. On connecting the power lead the receiver's display shows a figure 5 and after a few seconds, the 5 becomes a 0. Switching the set on and pressing any of the buttons or controls does nothing. The receiver does not work and the display remains on zero. Should I suspect the MSM5524 has gone faulty. Does the MSM5524 control the operation of the receiver? If it is the IC, does anyone know where I can source one? Thanks Roger ZS2RD (Ex G4TTE, ZS5ZD, ZS5L, ZS1J)

2nd Apr 2021, 8:08 am	#2
Kentode Octode Join Date: Mar 2015 Location: Yorkshire, England. Posts: 1,301	Re: Faulty Kenwood R 1000 One in stock at Jotrin, just Google it. Hope this helps and welcome to the forum. __________________ Regards, Ken. BVWS member

2nd Apr 2021, 8:34 am	#3
HECTOR63 Banned Join Date: Feb 2017 Location: Bedfordshire, UK. Posts: 601	Re: Faulty Kenwood R 1000 Yes I have one aswell which has been well messed about with! Been looking for replacement aswell, but there was a work round on a previous thread that I posted with regards to a You tube video on the subject but its not clear still as yet as to why so many parts were removed just to replace the display etc, but it appears to have been successful apparently! Meanwhile sorting out a number of issue with one I have, great shame brilliant radios but this has been hacked something rotten!!

2nd Apr 2021, 8:36 am	#4
HECTOR63 Banned Join Date: Feb 2017 Location: Bedfordshire, UK. Posts: 601	Re: Faulty Kenwood R 1000 https://www.vintage-radio.net/forum/...d.php?t=178068 This is the link that may help.

2nd Apr 2021, 8:51 am	#5
AmateurZS2RD Diode Join Date: Apr 2021 Location: Plettenberg Bay, Western Cape Province, South Africa. Posts: 8	Re: Faulty Kenwood R 1000 Is the IC purely for the display or is it part of the receivers circuitry as the receiver is totally dead as the on off switch does nothing to either rthe display or the dead receiver? When the radio is switched on, the lights on the meter and the kHz tuning display illuminate. I have also checked all voltages out of the PSU board on connector 12 and all voltages are present and correct. This unit really has me puzzled as there are very few test points that I can see. I do have the service manual for the unit.

2nd Apr 2021, 9:45 am	#6
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Faulty Kenwood R 1000 These receiver's will work even if the MSM5524 has been removed. Time to get the signal generator out. Here's how I replaced the chip in mine:- https://www.vintage-radio.net/forum/...ead.php?t=9585 __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

2nd Apr 2021, 11:23 am	#7
HECTOR63 Banned Join Date: Feb 2017 Location: Bedfordshire, UK. Posts: 601	Re: Faulty Kenwood R 1000 Tried the Jotrin and part N/A same as Mark5 link aswell so still waiting on display model to apply as per previous advices on this with you tube video

3rd Apr 2021, 11:38 pm	#8
Top Cap Octode Join Date: Mar 2006 Location: Watford, Hertfordshire, UK. Posts: 1,270	Re: Faulty Kenwood R 1000 There was an article in the Radio & Electronics World where they compared the FRG7700 with the Trio R1000. They covered parts of the circuitry that may be useful, I found them on the American WorldRadioHistory site. https://worldradiohistory.com/UK/Rad...EW-1981-12.pdf Pages 48 to 53. For info on the Phase Locked Loops and frequency display see:- https://worldradiohistory.com/UK/Rad...EW-1982-01.pdf Pages 76 to 81. Final Part https://worldradiohistory.com/UK/Rad...EW-1982-02.pdf Pages 28 to 31 __________________ Whether the Top Cap is Grid or Anode - touching it will give you a buzz either way!